Table 4. Chemical Environments and Peak Ratios of C1s, O1s, and Au4f for the Prepared CQDs-AuNPs.
| chemical environment and peak ratios | functional group | binding energy(eV) | CQD1-AuNPs | CQD2-AuNPs | CQD3-AuNPs |
|---|---|---|---|---|---|
| C1S | C=C | 284.5 | 75.6% | 75.0% | 74.4% |
| C–C, C–H | 285.0 | 4.8% | 21.6% | 12.4% | |
| C–OH, C–O–C | 286.5 | 2.6% | 2.7% | 0% | |
| C=O | 288.0 | 7.5% | 0.6% | 1.6% | |
| O–C=O | 289.0 | 9.5% | 0% | 11.6% | |
| O1s | C=O | 531.0 | 57.8% | 48.0% | 43.7% |
| O–(C=O*)–C | 531.6 | 20.8% | 35.4% | 40.2% | |
| C–OH | 533.6 | 0.3% | 0.3% | 0.2% | |
| *O–(C=O) | 534.8 | 21.2% | 16.3% | 15.9% | |
| Au4f | Au 4f7/20 | 84.0 | 62.6% | 67.5% | 54.7% |
| Au 4f7/2+ | 85.6 | 2.0% | 6.3% | 20.8% | |
| Au 4f7/2+3 | 87.3 | 34.0% | 3.9% | 15.3% | |
| Au 4f5/20 | 87.7 | 0% | 6.3% | 0% | |
| Au 4f5/2+ | 89.3 | 1.3% | 10.8% | 7.1% | |
| Au 4f5/2+3 | 90.9 | 0.1% | 5.2% | 2.1% |